05 starting air system

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1 © Wärtsilä 27 September 2007 W50DF05V00BTM01A Rev. 01

05.

STARTING AIR SYSTEMWÄRTSILÄ W50DF

STANDARD ENGINE




05 STARTING AIR SYSTEM

Starting air system arrangement - Internal

Fig. name: Principal scheme of internal starting air system

The engine is started by means of compressed air. Control air isneeded for timing the operation of pneumatically operated

starting valves and fuel injection pump pneumatic stop cylinders.

System components 01 Main starting valve

02 Flame arrester

03 Starting air valve in cylinder head

04 Starting air distributor

06 High pressure air filter

07 Water outlet valve

09 Blocking valve for turning gear

10 Non-return valve

11 Drain valve

12 Air container

14 Pneumatic stop cylinder

16 Slow turning valve

23 Booster servomotor for governor

26 Stop valve 28 Safety valve

29 Drain valve

30 Pressure regulator





Starting air system arrangement - Internal

Fig. name: Principal scheme of internal starting air system

Connections 301 Starting air inlet

302 Control air inlet





Starting air system on engine

Fig. name: Starting air system

Pressurised air to the engine is supplied throughthe starting air delivery piping (01) to the main

starting valve (02).

The start is performed by direct injection of air into

the cylinders through the starting valves in cylinder

heads (03), which are opened by a minor part of the air volume being diverted to the correct cylinder

head by the starting air distributor (04).

System components

01 Starting air delivery piping 02 Main starting valve

03 Starting valve in cylinder head

04 Starting air distributor

05 Flame arrester

06 Safety valve

Connections

301 Starting air inlet





Starting air system on engine

Fig. name: Starting air devices on engine (A-bank)

System components

01 Starting air delivery piping

02 Main starting valve

03 Pressure regulator

04 Slow turning valve

05 Drain valve

06 Non-return valve

07 Pressure gauge

Connections

A Starting air inlet to the engine

B Air to starting air delivery valve in cylinder head





Main starting valve

Fig. name: Main starting valve in main starting position

The main starting valve controls the starting air flowto the starting valves in cylinder heads during the

starting procedure.

Components

01 Housing

02 O-ring

03 Spool

04 O-ring

05 Spool cap 06 O-ring

07 Retaining ring

08 Spool stop

09 Spring

10 Screw

11 Vent plug nut

12 O-ring

13 Vent plug

14 Vent stem 15 O-ring

16 Vent piston

17 Nut

Connections

A Starting air inlet

B Starting air to cylinder heads and starting air

distributor C Control air inlet (main starting)

D Air vent





Starting air delivery valve in cylinder head

Fig. name: Starting valve in cylinder head

The starting air delivery valve opens and closes thestarting air supply to the cylinders.

Control air coming from the starting air distributor

controls the opening and closing of the valve during

the starting procedure.

Normally the valve is closed.

Components 01 Starting air delivery valve

02 Sealing ring

03 Sleeve

04 Extension

05 Yoke

06 Stud

07 Nut

Connections A Control air

B Starting air





Starting air delivery valve in cylinder head

Fig. name: Starting air delivery valve

Components 01 Piston

02 Housing

03 Spindle

04 Compression spring

05 Locking nut

06 Slide o-ring

07 O-ring

08 Slide o-ring

09 O-ring





Dummy in B-bank cylinder head

Fig. name: Dummy in B-bank cylinder head

There are no starting air delivery valves in the B-bankcylinder heads. A dummy has been installed instead.

Components

01 Dummy

02 Sealing ring

03 Sleeve

04 Extension

05 Yoke

06 Stud 07 Nut





Starting air distr ibutor

Fig. name: Starting air distributor

The starting air distributor controls the openingsequence and timing of the starting valves in

cylinder heads.

The starting air distributor is driven directly from the

camshaft. There is one piston type valve for

controlling each starting air delivery valve mountedin the cylinder head. The valves are situated

radially in the housing of the distributor.

Components

01 Housing 02 Screw plug

03 Bush

04 Spring

05 Slide

06 Starting cam

Connections

A Control air inlet

B Control air to starting air delivery valve





Flame arrester

Fig. name: Flame arrester

Components 01 Flame arrester

02 Starting air pipe

03 Cylinder head

Each starting air pipe branch to the starting valve incylinder head is provided with a flame arrester

before the valve. The flame arrester prevents

possible flame outburst from the combustion

chamber if the cylinder in question fires before the

starting sequence is over.





Safety valve

Fig. name: Starting air safety valve

At the end of the starting air manifold (at the freeend of the engine) there is a safety valve to relieve

any sudden overpressure in the manifold.

Components 01 Housing

02 Spindle

03 Spring

04 Plug

05 Sealing ring

06 Spring pin





High pressure air filter

Fig. name: High pressure air filter

The flow-through-type high pressure air filter removes impurities from control air.

Components

01 Cover

02 Housing

03 Bottom

04 Filter

05 Socket

06 O-ring

07 Ball valve

08 O-ring

Connections

A Air inlet

B Air outlet





Water outlet valve

Fig. name: Water outlet valve

Water drained from the high pressure air filter is ledto this water outlet valve, which is opened at the

same time as the main starting valve.

Components

01 Housing

02 Piston

03 O-ring

04 Push spring

05 O-ring

06 Screw plug

07 Sealing ring

08 Screw plug

09 Sealing ring

Connections

A Drain inlet from air filter

B Control air inlet

05 starting air system

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